Skip the auto shop - Our mechanics make house calls

Q: Misfire rough idle

asked by on

I needed to replace my raditaor so I did. it started to misfire and is barley idling. I replaced the plugs and the MAP sensor The O2 sensor is missing in the fuse box would that make the idle rough?
My car has an automatic transmission.

Changing the radiator should not have caused a misfire. Replacing the plugs and the MAP sensor was a great idea. What we commonly refer to as the O2 sensor is not located in the fuse box. There are two O2 sensors, and both of them are on your exhaust pipe. One is located between the engine and the catalytic converter. The other is located after the catalytic converter. These would make your engine idle roughly and not perform as desired. My thoughts are that you may have had more than one issue going on at the same time. With the age of your vehicle, its time for things to start showing some wear and tear. You should check your fuel filter and make sure it has flow. If it doesn’t allow gas to flow through it, your engine will be depleted of what it needs. Make sure your air filter is clean as well. If you would like, a certified technician from YourMechanic can come to your home or place of business to diagnose the rough idling.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: missfiring cylinder

It is possible the misfire is identified in a readout of Diagnostic Trouble Codes. If it is not intermittent, a diagnostic scope would quickly identify the cylinder. Could be a simple issue such as a spark plug wire defect or...

Q: Car won't start, fuel gauge and speedometer malfunctioning

This may be more than one problem, but I would suggest disconnecting the battery, disconnecting the BCM and ECM, and checking the connections and adding small amounts of Stabilant 22 or dielectric lube to the pins and reinstalling the connections....

Q: bad o2 sensors

Diagnostic Trouble Codes can never be used to "directly" condemn parts. In the case of an oxygen sensor, the oxygen sensor output must be evaluated on a scope to determine if the sensor itself is bad or if you perhaps...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...